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A dual‐band and dual‐polarized antenna based on a dual‐layer metasurface (DMTS) is proposed for 5G application. The proposed DMTS is designed on two substrates separated by an air loading layer using characteristic mode analysis (CMA). The upper metasurface (MTS) is an array of 4 × 4 square patches, while the lower MTS consists of a central rectangular patch and four parasitic patches. The DMTS is...